feat: ntile window function

[ariesdevil]

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Summary

Impl ntile window function.

Tracking: #11148

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
databend	⬜️ Ignored (Inspect)			Jun 30, 2023 7:56am

[ariesdevil]

askbend:summary

[databend-bot]

PR Summary(By llmchain.rs):

• Add support for Ntile window function
  The changes add support for the Ntile window function in the SQL query engine. This includes adding a new variant to the WindowFunction and WindowFuncType enums, as well as implementing the function in various structs and functions.

• Improve readability of DistributedCopyIntoTable
  The DistributedCopyIntoTable struct has been modified to add line breaks and improve readability.

• Update longrun.py
  Variable names have been changed to follow PEP8 naming conventions, whitespace has been added for readability, f-strings have been used for string formatting, and comments have been added for clarity. A try-except block has also been added for the subprocess.Popen() call.

• Add test cases for Ntile window function
  Test cases have been added for the Ntile window function in the window_basic.test and window_wisconsin.test files. These include tests for valid and invalid ntile() function calls.